US3679544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of water-resistant paper or nonwovens containing water soluble polyvinyl alcohol
Assignee: Kurashiki Rayon Co Ltd
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Filing: 1969-08-11
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Granted: 1972-07-25
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Expires: 1989-08-11
Abstract
Abstract A PROCESS FOR THE PRODUCTION OF PAPER OR NONWOVENS COMPRISING IMPREGNATING AT 40*C. OR BELOW PAPER OR NONWOVENS CONTAINING A WATER-SOLUBLE POLYVINYL ALCOHOL WHICH DISSOLVES IN WATER AT 95*C. OR BELOW WITH AN AQUEOUS MINERAL ACID SOLUTION OF A-TITANIC ACID WHICH HAS A TITANIUM CONCENTRATION OF AT LEAT 0.2% BY WEIGHT AND WHICH IS PREPARED AT 40*C. OR BELOW, THEN RINSING AND DRYING.
Inventors
- 👤 Tadao Ashikaga
- 👤 Shosuke Higashimori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:09
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/65; D21H13/00; D21H13/10; D21H13/12; D21H13/16; D21H17/20; D21H17/33; D21H17/34; D21H17/36; Y; Y10; Y10S; Y10S8/00; Y10S8/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |